I have had my chicks for 2 weeks. My 3 week old Silkie just had a bloody stool for the first time. Her stool looked normal, but it was covered in blood. Could it be that she strained to go or is she sick? I have been giving them medicated feed. She has been eating, drinking, etc, but she is the tiniest of my chicks. This is my first time with chicks so any advice would be helpful.